After this all node types are printed correctly in intermediate
output.

BUG=angleproject:1544
TEST=shader_translator -i

Change-Id: I5c120b0ff69f66b00db88e8423a1c698d339af22
Reviewed-on: https://chromium-review.googlesource.com/397319Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>